w (segment 
definition) 
Central 
version 
Long or 
design 
transaction 
w (segment 
| (eem 
Ww 
: 
(oo Checkpoint 
: 0, ' 
Ses w 
merge x () 
i" 
= 
A 
Checkpoint 
e 2 
w 
  
  
  
  
    
version 
Figure 2: Versioning and Long Transaction Support 
960 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996